red hands, red feet, no pain

My son is 19, about 5'10 and weighs about 205, so hes somewhat over weight. He doesnt get too much exercise, and lately we've been noticing that when he stands up his feet turn red. not all the time, but a lot of times, and its not because his shoes are too tight.. Also Ive noticed recently that his hands turn red out of nowhere too.. one minute they'll be normal, and then he'll go to grab something and theyre red.. he says there is no pain, no odd sensations, no hotness or coldness... only color.. it also happens when he gets out of the shower... only hands and feet, no knees.. any ideas?

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